Journal
ELECTRONICS
Volume 6, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/electronics6040096
Keywords
high power amplifiers; high frequency transmitters; wireless communications; high efficiency; Doherty power amplifier; Chireix outphasing amplifier; load modulated balanced amplifier
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Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the amplifier load impedance as a function of the input power. In this paper, a review of the widely-adopted Doherty power amplifier and of the other load-modulation efficiency enhancement techniques is presented. The main theoretical aspects behind each method are introduced, and the most relevant practical implementations available in recent literature are reported and discussed.
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